Riken Keiki NP-1000 User manual

PT0E-1493
Portable Combustible
Gas Detector
NP-1000
Operating Manual
(PT0-149)

- 2 -
Contents
1. Outline of the Product..................................................................................................................................... 4
Preface........................................................................................................................................................ 4
Purpose of use............................................................................................................................................ 4
Definition of DANGER, WARNING, CAUTION and NOTE ........................................................................ 4
2. Important Notices on Safety........................................................................................................................... 5
2-1. Danger cases ...................................................................................................................................... 5
2-2. Warning cases ..................................................................................................................................... 5
2-3. Precautions.......................................................................................................................................... 6
2-4. Safety information................................................................................................................................ 8
3. Product Components...................................................................................................................................... 9
3-1. Main unit and standard accessories.................................................................................................... 9
3-2. Names and functions for each part ................................................................................................... 11
4. How to Use ...................................................................................................................................................14
4-1. Before using the gas detector ...........................................................................................................14
4-2. Preparation for start-up .....................................................................................................................14
4-3. How to start the gas detector ............................................................................................................17
4-4. Basic operating procedures............................................................................................................... 20
4-5. Performing air calibration .................................................................................................................. 21
4-6. How to detect..................................................................................................................................... 23
4-7. Switching range mode ....................................................................................................................... 25
4-8. Snap logger .......................................................................................................................................26
4-9. Power-off ...........................................................................................................................................27
5. How to Set Display Mode ............................................................................................................................. 28
5-1. Entering the display mode.................................................................................................................28
5-2. Concentration displayed gas reading setting (base)......................................................................... 31
5-3. Alarm setpoint display .......................................................................................................................34
5-4. Pump suction volume setting ............................................................................................................36
5-5. Log data display ................................................................................................................................38
6. How to Set User Mode .................................................................................................................................40
6-1. Entering the user mode .....................................................................................................................40
6-2. Peak bar display setting .................................................................................................................... 43
6-3. Date/time setting................................................................................................................................45
6-4. Alarm setpoint setting ........................................................................................................................46
7. Calibration ....................................................................................................................................................48
7-1. Preparation for air and N2/CO2 calibrations .....................................................................................48
7-2. Entering calibration mode.................................................................................................................. 50
7-3. Bump test (base gas: N2).................................................................................................................. 53
7-4. Air calibration .....................................................................................................................................55
7-5. N2 calibration..................................................................................................................................... 56
7-6. CO2 calibration..................................................................................................................................57
7-7. AUTO CAL (base gas: N2) ................................................................................................................ 58
7-8. ONE CAL ...........................................................................................................................................60
7-9. Bump test condition setting ...............................................................................................................62
7-10. Password setting .............................................................................................................................64
8. Alarm Function..............................................................................................................................................66
8-1. Gas alarm activation..........................................................................................................................66
8-2. Fault alarm activation ........................................................................................................................68
9. Maintenance .................................................................................................................................................69
9-1. Maintenance intervals and items.......................................................................................................69
9-2. How to clean......................................................................................................................................71
9-3. Parts replacement .............................................................................................................................72

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10. Storage and Disposal .................................................................................................................................73
10-1. Procedures to store the gas detector or leave it for a long time ..................................................... 73
10-2. Procedures to use the gas detector again ......................................................................................73
10-3. Disposal of products........................................................................................................................73
11. Troubleshooting ..........................................................................................................................................75
11-1. Abnormalities on unit .......................................................................................................................75
11-2. Abnormalities of readings ................................................................................................................76
12. Product Specifications................................................................................................................................77
12-1. List of product specifications ........................................................................................................... 77
12-2. List of optional parts ........................................................................................................................78
Appendix...........................................................................................................................................................79
13-1. Definition of terms ...........................................................................................................................79

1. Outline of the Product Preface
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1
1. Outline of the Product
Preface
Thank you for choosing our portable combustible gas detector NP-1000 (hereinafter referred to as the gas
detector). Please check that the model number of the product you purchased is included in the
specifications on this manual.
This manual explains how to use the gas detector and its specifications. It contains information required
for using the gas detector properly. Not only the first-time users but also the users who have already used
the product must read and understand the operating manual to enhance the knowledge and experience
before using the gas detector.
Note that the contents of this manual are subject to change without notice for product improvement. It is
also prohibited to copy or reproduce this manual, in whole or in part, without permission.
Regardless of warranty period, we shall not make any indemnification for accidents and damage caused
by using the gas detector.
Make sure to read the warranty policy specified on the warranty.
Purpose of use
This product is used to detect combustible gases (vol%).
It detects combustible gases for a gas storage tank or pipeline.
Detection results are not intended to guarantee life or safety in any way.
Definition of DANGER, WARNING, CAUTION and NOTE
Throughout this manual, the following indications are used to ensure safe and effective work.
DANGER This message indicates that improper handling may cause serious damage on
life, health or assets.
WARNING This message indicates that improper handling may cause serious damage on
health or assets.
CAUTION This message indicates that improper handling may cause minor damage on
health or assets.
NOTE This message indicates advice on handling.

2. Important Notices on Safety 2-1. Danger cases
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2
2. Important Notices on
Safety
To maintain the performance and use the gas detector safely, observe the following instructions of
DANGER, WARNING and CAUTION.
2-1. Danger cases
2-2. Warning cases
WARNING
Sampling point pressure
The gas detector is designed to draw gases under the atmospheric pressure. If excessive
pressure is applied to the gas inlet (GAS IN) and outlet (GAS OUT) of the gas detector,
measured gases may leak out from its inside and may cause dangerous conditions. Be sure
that excessive pressure is not applied to them while used.
Do not connect the gas sampling hose directly to a location with a pressure higher than the
atmospheric pressure. The internal piping system may be damaged.
Air calibration in atmosphere
When air calibration is performed in the atmosphere, check the atmosphere for freshness
before beginning it. If interference gases exist, the adjustment cannot be performed properly,
thus leading to dangers when the gas leaks.
Battery level check
Before use, check that there remains sufficient battery power. When the gas detector is not
used for a long period, the batteries may be exhausted. Never fail to replace them with new
ones before use.
If a low battery voltage alarm is triggered, gas detection cannot be conducted. If the alarm is
triggered during use, turn off the power and promptly replace the batteries in a safe area.
DANGER
About use
While conducting measurement in a confined space such as inside of the gas storage tank
and pipeline, do not lean over or look into the gas storage tank or pipeline. It may lead to
dangers because oxygen-deficient air or other gases may blow out.
Oxygen-deficient air or other gases may be discharged from the gas exhausting outlet (GAS
OUT). Never inhale the air or gases.

2. Important Notices on Safety 2-3. Precautions
- 6 -
2-3. Precautions
CAUTION
Do not use the gas detector where it is exposed to oil, chemicals, etc. Do not submerge the
gas detector under water on purpose.
Do not use in a place where the gas detector is exposed to liquids such as oil and chemicals.
The gas detector, being compliant to IP67, is not water-pressure-resistant. Do not use the
gas detector where a high water pressure is applied to it (under a faucet, shower, etc.) or
submerge it under water for a long time. The gas detector is water-proof only in fresh water
and running water, and not in hot water, salt water, detergent, chemicals, human sweat, etc.
The gas inlet and outlet are not water-proof. Be careful not to let water such as rainwater,
etc. get into these parts. Because this may cause trouble and gas cannot be detected.
Do not place the gas detector where water or dirt gets accumulated. The gas detector placed
at such a location may cause malfunction due to water or dirt that gets into the buzzer
opening, etc.
Note that drawing in dirty water, dust, metallic powder, etc. will significantly deteriorate the
sensor sensitivities. Be careful when the gas detector is used in an environment where these
elements exist.
Do not use the gas detector in a place where the temperature drops below -20ºC or rises
over 50ºC.
The operating temperature of the gas detector is -20 to +50ºC. Do not use the gas detector at
higher temperatures, humidities and pressures or at lower temperatures than the operating
range.
Avoid long-term use of the gas detector in a place where it is exposed to direct sunlight.
Do not store the gas detector in a sun-heated car.
Observe the operating restrictions to prevent condensation inside the gas detector or gas
sampling hose.
Condensation formed inside the gas detector or gas sampling hose causes clogging or gas
adsorption, which may disturb accurate gas measurement. Thus, condensation must be
avoided. In addition to the operating environment, carefully monitor the temperature/humidity
of the sampling point to prevent condensation inside the gas detector or gas sampling hose.
Please observe the operating restrictions.
Do not use a transceiver near the gas detector.
Radio wave from a transceiver near the gas detector may disturb readings. If a transceiver or
other radio wave transmitting device is used, it must be used in a place where it disturbs
nothing.
Do not use the gas detector near a device that emits strong electromagnetic waves (high-
frequency or high-voltage devices).
Verify that the pump driving indicator is rotating before using the gas detector
If the flow check display is not rotating, gas detection cannot be performed properly. Check
whether the flow rate is lost.
WARNING
Others
Do not throw the gas detector into fire.
Do not wash the gas detector in a washing machine or ultrasonic cleaner.
Do not block the buzzer sound opening. No alarm sound can be heard.
Do not remove the battery while the power is on.
Be sure to connect the gas sampling probe to the gas detector and check that the
surrounding air is fresh before turning on the power.
If the main unit is dropped or given a shock, the reading may rise and it may remain so. In
such a case, perform air calibration in a place where the surrounding air is fresh.

2. Important Notices on Safety 2-3. Precautions
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CAUTION
Never fail to perform a regular maintenance.
Since this is a safety unit, a regular maintenance must be performed to ensure safety.
Continuing to use the gas detector without performing maintenance will compromise the
sensitivity of the sensor, thus resulting in inaccurate gas detection.
Others
Pressing buttons unnecessarily may change the settings, preventing alarms from activating
correctly. Operate the gas detector using only the procedures described in this operating manual.
Do not drop or give shock to the gas detector. The accuracy of the gas detector may be
deteriorated.
Do not jab the buzzer opening with a sharp-pointed item. Doing so may cause a failure or
damage.
Do not remove the panel sheet on the display. The water-proof and dust-proof performances
will be deteriorated.
Do not affix a label or the like on the infrared port. Infrared communications can no longer be
conducted.
The operating environment may include gases that have harmful effects on the sensor of the
gas detector. The gas detector cannot be used in the presence of the following gases:
(1) High-concentration sulfides that exist continuously (such as H2S, SO2, etc.)
(2) Halogen gases (such as chloride compounds, fluorocarbons, etc.)
(3) Silicone (Si compounds)
Do not use the gas detector in the presence of the above gases (such as high-concentration
sulfides, halogen gases, silicone, etc.), which may shorten the sensor life significantly or
cause malfunctions such as inaccurate readings.
In case the gas detector is used for detection in the presence of silicone, etc., be sure to
check the gas sensitivities before using it again.
About battery replacement
Never fail to turn off the power of the gas detector before replacing the batteries.
Replace the batteries in a safe place.
Replace all of the four batteries with new ones at one time.
The conditions for the explosion-proof standard of the gas detector include the use of
TOSHIBA batteries. To use the unit as an explosion-proof product, use four AA alkaline
batteries (LR6) manufactured by TOSHIBA Corporation.
Pay attention to the polarities of the batteries.
Usage
In a low-temperature environment, the operating time is shortened due to the battery
performance property.
At low temperatures, the responses of the LCD display may slow down.
Note the following points for air calibration according to the operating environment.
(1) Before performing air calibration in the atmosphere, check that the surrounding air is
fresh.
(2) Before checking air purge, be sure to perform air calibration with the purge air of the gas
storage tank or pipeline to use. Measurement should be performed in the purge air
environment to obtain correct results.
Perform air calibration after the reading is stabilized.
If there is a sudden temperature change of 15ºC or more between the storage and
operational locations, turn on the power of the gas detector, let it stand for about 10 minutes
in a similar environment to the operational location, and perform air calibration in fresh air
before using it.
When cleaning the gas detector, do not splash water over it or use organic solvents such as
alcohol and benzine on it. The surface of the gas detector may be discolored or damaged.
If the gas detector is not used for a long time, turn on the power at least once every six
months and check that the pump draws in air (about three minutes). The gas detector, when
not activated for a long time, may cease to work because of hardening of the grease in the
pump motor.
If the gas detector is not used for a long time, store it after removing the batteries. Battery leaks may
result in fire, injury, etc.
When the gas detector is used again after a long-period storage, never fail to perform air calibration.
For information on read
j
ustment includin
g
air calibration
,
p
lease contact RIKEN KEIKI.

2. Important Notices on Safety 2-4. Safety information
- 8 -
2-4. Safety information
Outline of the unit
The combustible gas detector model NP-1000 is designed to monitor combustible gases in a hazardous
area.
The detection range of NP-1000 is 0 to 100 vol%.
A sample gas is drawn by the built-in small pump.
The power is supplied by AA alkaline batteries (LR6, manufactured by TOSHIBA, four pieces) only.
Replacing batteries in a hazardous area is prohibited.
Technical data
Explosion-
proof
specifications
Explosion-
proof class
Ex ia IIC T4 Ga
II1G Ex ia IIC T4 Ga
Ambient
temperature
range
-20 - +50ºC
Electrical
specifications Driven by four AA alkaline batteries (LR6, manufactured by
TOSHIBA).
Certificate
number
IECEx IECEx DEK13.0090
ATEX DEKRA 13 TEX0227
Applied
standards
IEC60079-0: 2011
IEC60079-11:2011
EN60079-0:2012+A11:2013
EN60079-11:2012
Precautions
･Do not replace the batteries in a hazardous area.
･Do not disassemble/modify the gas detector.
･Use only AA alkaline batteries (LR6, manufactured by TOSHIBA) as
power supply.
･Use only CR1220 (manufactured by Hitachi Maxell) as backup power
supply.
How to read
instruction
number
INST.No. 0 0 000 0000 00
A B C D E
A: Manufacturing year (0-9)
B: Manufacturing month (1-9, XYZ for Oct.-Dec.)
C: Manufacturing lot
D: Serial number
E: Factory code
Manufacturer
RIKEN KEIKI CO., LTD.
2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744 Japan
Web site: http://www.rikenkeiki.co.jp/

3. Product Components 3-1. Main unit and standard accessories
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3
3. Product Components
3-1. Main unit and standard accessories
After opening the carton box, check the gas detector and accessories.
If there is anything missing, contact RIKEN KEIKI.
Main unit
For names and functions of individual parts of the gas detector and LCD display, see "Names and
functions for each part" (P. 11).
<Main Unit>
Accessories
AA alkaline battery
: 4 pcs
(installed)
Gas sampling
probe +
gas sampling hose
(1 m): 1 pc
Hand strap (1 pc)
Product warranty (1 pc)
Operating manual: 1 copy

3. Product Components 3-1. Main unit and standard accessories
- 10 -
DANGER
About explosion-proof
Do not modify or change the circuit, structure, etc.
When using the gas detector in a hazardous area, take the following countermeasures for
preventing dangers resulting from electrostatic charges.
(1) Wear anti-static clothes and conductive shoes (anti-static work shoes).
(2) For indoor use, use the gas detector while standing on a conductive work floor (with a
leakage resistance of 10 MΩor less).
Replace the batteries in a non-hazardous area.
The specifications of the gas detector are as follows:
Power supply: 6.0 VDC (LR6, manufactured by TOSHIBA, 4 pcs)
Ambient temperature: -20 - +50ºC
The explosion-proof class of the gas detector is as follows:
Ex ia IIC T4 (TIIS explosion-proof certification)
II1G Ex ia IIC T4 Ga (ATEX explosion-proof directive)
Ex ia IIC T4 Ga (IECEx explosion-proof directive)
The protective class of the case to be explosion-proof is IP20.
IP20 is a protection class to be explosion-proof. The IP protection class is compliant to IP67
level by factory default.

3. Product Components 3-2. Names and functions for each part
- 11 -
3-2. Names and functions for each part
This section describes names and functions of main unit and battery unit parts and LCD display.
<Exterior of Main Unit>
No. Name Function
(1) LCD display Displays gas concentrations, measured gas name, alarms, etc.
(2) Buzzer sound opening Emits operation and alarm sounds. (Do not block it.)
(3) Alarm lamp window Blinks (in red) in response to an alarm state.
(4) AIR/▲button Keep this switch pressed to perform air calibration.
(5) RESET/▼button When an alarm occurs, press this switch to reset the alarm.
(6) DISPLAY button Press this switch to change between display modes.
(7) POWER/ENTER
button
Turns the power ON or OFF.
(8) Gas inlet Connect a gas sampling hose to this port.
(9) Gas outlet Exhausts the gas drawn into the gas detector. (Do not block it.)
(10) Lock plate Retains the battery cover.
(11) Battery cover Protects the battery.
(12) IR port Used to send and receive data. While the data logger management
software (option) is used, this port is used to upload detection data to
the PC and configure the settings of the gas monitor from the PC.
(1) LCD display
(8) Gas inlet(9) Gas outlet
(11) Battery cover
(10) Lock plate
(2) Buzzer sound
opening
(3) Alarm lamp
window
(6) DISPLAY
button
(7) POWER/
ENTER
(4) AIR/▲button
(5) RESET/▼
button
(12) IR port

3. Product Components 3-2. Names and functions for each part
- 12 -
<LCD Display>
No. Name Function
(1) Pilot indicator Displays the operating status in the detection mode. Normal:
Blinking
(2) Flow check display Displays the drawing status. Normal: Rotating
(3) Range mode display Displays the Lo/Auto range with an icon. No icon is displayed in the
Hi range mode.
(4) Battery level icon Displays a reference of the battery level.
(5) Gas name display Displays detected gases name.
(6) Concentration and unit
display
Displays gas concentration and unit.
(7) Full scale and bar
display
Displays the level of gas concentration with the bar meter
as well as the full scale value.
(8) Clock display Displays the current time.
NOTE
The meanings of battery level icons are as follows:
: Sufficient/ : Low/ : Needs charging
If the battery level further drops, the inside of the battery icon starts to blink ( ).
Range mode display
･Lo: Fixed to the low range (0 - 10.0 vol%)
･Auto: Automatic range switching that switches between the low and high ranges automatically
･Hi: Fixed to the high range (0 - 100 vol%)
(8) Clock display
(7) Full scale
and bar display
(6) Concentration
and unit display
(5) Gas
name
(1) Pilot indicator
(2) Flow check
display
(3) Range mode
display
(4) Battery level
icon

3. Product Components 3-2. Names and functions for each part
- 13 -
Gas sampling probe and gas sampling hose
No. Name Function
(1) Gas sampling probe Placed in a detection area to collect a gas.
The probe includes a dust filter.
(2) Gas sampling hose A resin hose through which the sampled gas goes.
(3) Hose clamp coupler A joint that connects with the main unit.
(3) Hose
clamp coupler
(2) Gas sampling
hose
(1) Gas sampling
probe

4. How to Use 4-1. Before using the gas detector
- 14 -
4
4. How to Use
4-1. Before using the gas detector
Not only the first-time users but also the users who have already used the gas detector must follow the
operating precautions.
Ignoring the precautions may damage the unit, resulting in inaccurate gas measurement.
4-2. Preparation for start-up
Before starting gas detection, check the followings
Check that the protective film attached on the display from shipping is removed.
The batteries are installed (with sufficient battery level).
The dust filter is not contaminated.
The gas sampling probe is not loose.
The hose clamp coupler is connected securely.
4-2-1. How to replace the batteries
When the gas detector is used for the first time, or when the battery level is low, attach new AA alkaline
batteries according to the following procedures.
1 Check that the power of
the gas detector is turned
off.
Turn off the power if it is turned on.
2 Release the lock and open
the battery cover.
Lock plate
CAUTION
The display is covered by the protective film to prevent scratches from shipping.
Be sure to remove this film before use.
Gas monitor with this film will not satisfy the explosion-proof performance.

4. How to Use 4-2. Preparation for start-up
- 15 -
3 Remove old batteries and
then put new batteries
while observing the
correct polarity.
4 Close the battery cover
and lock it.
The lock clicks.
4-2-2. Gas sampling probe maintenance
Check the dust filter inside the gas sampling probe visually.
･Check that the dust filter is not contaminated.
<Dust Filter Replacement Procedure>
Check that the dust filter inside the gas sampling probe is not contaminated visually.
If the dust filter is contaminated, replace it following the procedure below.
1 Hold the middle section
(filter case) of the gas
sampling probe and
remove the tip section by
turning it
counterclockwise.
CAUTION
Never fail to turn off the power of the gas detector before replacing the batteries.
Replace the batteries in a safe place.
Replace all of the four batteries with new ones at one time.
Pay attention to the polarities during replacement.
If the battery cover is not completely locked, the dry batteries may drop off or water may get
in through the clearance. Water may also get in if a minute foreign substance is caught
between the gas detector and battery cover.
DANGER
The conditions for the explosion-proof standard of the gas detector include the use of
TOSHIBA batteries. To use the unit as an explosion-proof product, use four AA alkaline
batteries (LR6) manufactured by TOSHIBA Corporation.
Battery

4. How to Use 4-2. Preparation for start-up
- 16 -
2 Remove the contaminated
dust filter from the middle
section (filter case) and
then put a new filter in the
case.
There are no differences between
the front and back sides of the dust
filter.
3 Connect the tip section by
turning it clockwise.
Tighten it securely. Loose connection
may cause a leak.
Tighten it by hand.
<Installation>
Connect the gas sampling probe to the main unit as shown in the following figure.
Insert the hose clamp coupler into the gas inlet of the main unit while pulling the release ring, and then
release the release ring.
NOTE
Insert the hose releasing coupler to the gas inlet (GAS IN) side securely until it clicks.
Main unit
Release ring
(hose clamp coupler)
CAUTION
Use only a gas sampling hose specified by RIKEN KEIKI.
Use the gas detector with the gas sampling probe connected to the gas sampling hose so
that no foreign substance is drawn into it.
Be sure to connect the gas sampling probe and gas sampling hose by hand. If they are
fastened too tight using a tool, the plastic part of the gas sampling probe may be broken.
Dust filter

4. How to Use 4-3. How to start the gas detector
- 17 -
4-3. How to start the gas detector
When the power is turned on, a self-diagnostic starts, and then the gas detector enters the detection
mode.
Power-on
Press and hold the POWER button until the buzzer blips (three seconds or longer) to turn on the power.
When the power is turned on, the LCD display changes automatically as shown below, and the gas
detector enters the detection mode.
1 Press and hold the POWER button for three seconds or longer.
Hold it down
until all the
LCDs and
alarm lamp
light up and
the buzzer
blips.
All LCDs light
up
▼
Date/time
display
Display example:
Wednesday, June 1, 2016
8:30
▼
Battery
voltage
display
Alarm type
display
Display example:
Battery voltage 6.0 V
Non latching (auto-reset): AL-A
(Alarm-Auto)
* Alarm type
Self-latching: AL-H (Alarm-
Hold)
Non latching (auto-reset): AL-
A (Alarm-Auto)
▼
Gas name
display
Display example:
CH4

4. How to Use 4-3. How to start the gas detector
- 18 -
▼
Full scale
Display
Display example:
100 vol%
▼
WARNING
Setting
display
▼
Display in setting alarm (P. 34)
Display example: 50 vol%
▼
ALARM
Setting
display
▼
Display in setting alarm (P. 34)
Display example: 50 vol%
▼
Warm-up
display
▼

4. How to Use 4-3. How to start the gas detector
- 19 -
The buzzer
blips twice
and the
detection
mode is
displayed.
Detection
mode
NOTE
The range mode used at the last power off is retained.
If there is an abnormality in the built-in clock, a fault alarm FAIL CLOCK may be triggered. In this
case, contact RIKEN KEIKI immediately.
WARNING
If the main unit is dropped or given a shock, the reading may rise and it may remain so. In
such a case, perform air calibration in a place where the surrounding air is fresh.

4. How to Use 4-4. Basic operating procedures
- 20 -
4-4. Basic operating procedures
The detection mode is used after power-on.
NOTE
Of the fault alarms, only the low flow rate alarm "FAIL - LOW FLOW" can be reset by pressing the
RESET button after removing the cause of low flow rate. For other fault alarms, turn off the power
and then promptly contact RIKEN KEIKI.
The backlight goes off after 30 seconds or so of no operation. It lights up continuously while an
alarm is activated.
<Display Mode>
Operate AIR button
Operate DISPLAY button
Operate RESET button
*For alarms other than
"FAIL - LOW FLOW"
and "FAIL - CLOCK",
turn off the power and
contact RIKEN KEIKI
for repair.
Operate ▼and DISPLAY buttons
<Snap Logger Mode>
<Detection Mode>
LCD Display
<Calibration Mode>
<Gas Alarm>
<Fault Alarm>
<>
Operate ▼ and ▲buttons